This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A133116 #5 Mar 20 2022 22:55:40 %S A133116 1,1,1,3,1,1,3,3,5,1,5,3,13,5,1,5,5,25,13,9,1,7,5,43,25,31,9,1,7,7,67, %T A133116 43,79,31,13,1,9,7,99,67,171,79,57,13,1,9,9,139,99,331,171,181,57,17,1 %N A133116 2*A133114 - A000012. %C A133116 Row sums = A000325, 2^n - n: (1, 2, 5, 12, 27, 58, 121, ...). %F A133116 2*A133114 - A000012 as infinite lower triangular matrices. %e A133116 First few rows of the triangle: %e A133116 1; %e A133116 1, 1; %e A133116 3, 1, 1; %e A133116 3, 3, 5, 1; %e A133116 5, 3, 13, 5, 1; %e A133116 5, 5, 25, 13, 9, 1; %e A133116 7, 5, 43, 25, 31, 9, 1; %e A133116 7, 7, 67, 43, 79, 31, 13, 1; %e A133116 ... %Y A133116 Cf. A133114, A000012. %K A133116 nonn,tabl %O A133116 2,4 %A A133116 _Gary W. Adamson_, Sep 14 2007